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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c595fc322ca04d47a718e7792aee71554eab41e294228779edd20791fa0ec0e' 
  AND token = 'B4MOxOcg+1OSKztjKU7RWw91mGNzisE8F34T10Sohus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}